Windows Server 2008 hard drive says it's full, but it's not

I have a 400GB hard drive on my Win 2008 virtual machine.  Disk Management reports that it has 30.25GB (8%) free space.  When I right click on the one and only top most folder, it reports a size on disk of 177GB.  I can't figure out where the other 220GB went!

I have show hidden files turned on, shadow copies are disabled on the drive, recycle bin is empty and WinDirStat does not reveal anything.
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JohnBusiness Consultant (Owner)Commented:
There could be backups being made. That is common on workstations, but I do not see this on servers. Worth checking.

Get Tree Size Pro (Jam Software) and install it. Run it as Administrator. Set it to show hidden files and it will show you very quickly what is chewing up space.

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NinjaStyle82Systems AdministratorCommented:
its probably logs, defraggler also has a option disk scan that grabs lots of things windirstat misses like logs etc. then you can sort it by size.
Use CCleaner to clean temp files, etc.  I have it on all my computers.
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markbeasAuthor Commented:
Looks like Tree Size Pro picked up 192.5GB of System Volume Information.  Double clicking that slice of pie in the graph show a bunch of smaller files with what appear to filenames with GUID's in them.Capture.PNG
Did CCleaner picked and cleaned it up?
NinjaStyle82Systems AdministratorCommented:
Might be Windows Server Backup data that needs to be cleaned up..
JohnBusiness Consultant (Owner)Commented:
Try running Disk Cleanup on your server. You may have to install this through the features menu.

There is an option in Disk Cleanup to clean up System Files. This might clean up some space.
NinjaStyle82Systems AdministratorCommented:
also, some people have had success enabling and then disabling shadow copies to clean up that folder.
NinjaStyle82Systems AdministratorCommented:
Try running Disk Cleanup on your server. You may have to install this through the features menu.

Disk cleanup needs to be installed though the desktop experience package, which puts a ton of junk on the server, i don't recommend it.
JohnBusiness Consultant (Owner)Commented:
I think you might be able to install just what you need. Disk Cleanup is a very good Microsoft offering for removing old (system) files without damaging anything.
often running a diskcheck on the drive fixes these problems
so that's my suggestion - run chkdsk
Those files in System Volume Information are most likely System Backup and Shadow Volume Copy files.
Read this article.
noxchoGlobal Support CoordinatorCommented:
These are volume snapshots. Disable the volume shadow copy on the volume and delete already created ones. See here how:
run cmd as admin
cmd> Diskshadow
Diskshadow> List shadows all (to see what shadows exist)
Diskshadow> delete shadows all
JohnBusiness Consultant (Owner)Commented:
@markbeas - Thanks and I was happy to help.
NinjaStyle82Systems AdministratorCommented:
What was the actual solution? why was my suggestion of it being shadow copies or backup data worse than noxcho or Predrag Jovic?
markbeasAuthor Commented:
Frank, yes sorry your suggestion about shadow copies was helpful.  I followed noxcho's instructions to view and delete the shadow copies instead of enabling/disabling them and this cleared up 192GB of disk space.

Is there a way to go back and add to the Accepted Solutions?
NinjaStyle82Systems AdministratorCommented:
not sure, no biggie.
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